<!--动态表单（设计器）-->
<template>
  <div class="fancyDynamicTable">
    <el-table
      :data="tableData"
      :fit="true"
      border
      :ref="conf.id"
      size="small"
      :cell-style="{ padding: '5px 0' }"
      :header-cell-style="{ background: '#F5F7FA' }"
      style="width: 100%"
      :row-class-name="tableRowClassName"
      @selection-change="handlerSelectionChange"
      :show-summary="conf['show-summary']"
      :summary-method="sumTotal"
    >
      <el-table-column
        align="center"
        type="selection"
        width="35px"
        v-if="conf.multiCheck"
        fixed="left"
      />
      <el-table-column
        align="center"
        type="index"
        label="序号"
        width="50px"
        v-if="conf.showIndex"
        fixed="left"
      />
      <el-table-column
        align="center"
        :prop="item.id"
        v-for="(item, index) in conf.columns"
        :key="index"
        min-width="240px;"
      >
        <template #header>
          {{ tableColumnLabels[index] }}
        </template>
        <template #default="scope">
          <slot name="item" :rowScope="scope" :item="item"></slot>
        </template>
      </el-table-column>
      <el-table-column
        align="center"
        label="操作"
        width="100px"
        v-if="conf.buttonDel"
        fixed="right"
      >
        <template slot-scope="scope">
          <el-form-item label-width="0px" style="margin: 10px 3px 15px 3px">
            <i class="el-icon-delete optIcon" style="" @click="handlerDelete(scope, conf)"></i>
          </el-form-item>
        </template>
      </el-table-column>
    </el-table>
    <div class="column-buttons">
      <i
        class="el-icon-circle-plus-outline optIcon button-plus"
        v-if="conf.buttonAdd"
        @click="handlerAdd(conf)"
      />
      <i
        class="el-icon-remove-outline optIcon button-plus"
        v-if="BachDeleteButtonShow(conf.id)"
        @click="handlerBachDelete"
      />
    </div>
  </div>
</template>
<script>
export default {
  name: 'fancyDynamicTable',
  props: ['data', 'conf'],
  data() {
    return {
      tableData: this.data,
      tableColumns: [],
      tableColumnLabels: [],
      multipleSelection: [],
      componentsMount: false
    };
  },
  mounted() {
    this.conf.columns.forEach((element) => {
      this.tableColumnLabels.push(element.label);
      let tableCol = {};
      Object.assign(tableCol, element);
      this.tableColumns.push(tableCol);
    });
    this.componentsMount = true;
  },
  components: {},
  methods: {
    handlerAdd(origin) {
      this.$emit('addRow', origin);
    },
    handlerDelete(scope, element) {
      this.$emit('deleteRow', scope, element);
    },
    handlerBachDelete() {
      this.$confirm('确认删除选中的数据?').then(() => {
        const indexs = [];
        this.multipleSelection.forEach((item) => indexs.push(item.index));
        this.$emit('batchDeleteRow', indexs, this.conf);
      });
    },
    handlerSelectionChange(val) {
      this.multipleSelection = val;
    },
    tableRowClassName(row) {
      row.row.index = row.rowIndex;
    },
    sumTotal(param) {
      const { columns, data } = param;
      const sums = [];
      columns.forEach((column, index) => {
        if (index === 0) {
          sums[index] = this.conf['sum-text'];
          return;
        }
        const values = data.map((item) => Number(item[column.property]));
        if (!values.every((value) => isNaN(value))) {
          sums[index] = values.reduce((prev, curr) => {
            const value = Number(curr);
            if (!isNaN(value)) {
              return prev + curr;
            } else {
              return prev;
            }
          }, 0);
          sums[index] += ' ' + this.conf['summary-text'];
        } else {
          sums[index] = '';
        }
      });

      return sums;
    }
  },
  computed: {
    BachDeleteButtonShow() {
      return function (id) {
        if (this.componentsMount) {
          return this.conf.multiCheck && this.$refs[id].selection.length > 0;
        }
      };
    }
  }
};
</script>
<style scoped>
.fancyDynamicTable {
  width: 100%;
  padding: 10px;
}
.column-buttons {
  padding: 5px 0 5px 0;
  text-align: center;
  background-color: #f6f6f6;
}
.optIcon {
  font-size: 18px;
  margin-right: 5px;
  cursor: pointer;
}
.button-plus {
  font-size: 30px;
  margin-right: 10px;
}
.button-plus:hover {
  color: #000000;
}
</style>
